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        手机端调试的小技巧
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    <p>做移动端开发的时候，每次想看某个变量的时候都得 alert，点来点去很麻烦，于是自己写了一个创建一个调试窗的方法，以后吧 console.log 换成这个，就可以在移动端界面中直接看到日志输出了。</p>
<p>使用方法：</p>
<ol>
<li>将 createLog 粘贴进你的代码</li>
</ol>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createLog</span>(<span class="params">log</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> logDom = <span class="built_in">document</span>.getElementById(<span class="string">'consoleLog'</span>);</span><br><span class="line">  <span class="keyword">if</span> (logDom) &#123;</span><br><span class="line">    logDom.innerHTML += <span class="string">'&lt;br&gt;'</span> + log;</span><br><span class="line">  &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">    <span class="keyword">var</span> logDiv = <span class="built_in">document</span>.createElement(<span class="string">'div'</span>);</span><br><span class="line">    logDiv.id = <span class="string">'consoleLog'</span>;</span><br><span class="line">    logDiv.innerHTML = log;</span><br><span class="line">    logDiv.style.position = <span class="string">'absolute'</span>;</span><br><span class="line">    logDiv.style.top = <span class="string">'0'</span>;</span><br><span class="line">    logDiv.style.left = <span class="string">'0'</span>;</span><br><span class="line">    logDiv.style.backgroundColor = <span class="string">'#000000'</span>;</span><br><span class="line">    logDiv.style.color = <span class="string">'rgb(0, 247, 32)'</span>;</span><br><span class="line">    logDiv.style.zIndex = <span class="string">'10000'</span>;</span><br><span class="line">    logDiv.style.opacity = <span class="string">'.8'</span>;</span><br><span class="line">    logDiv.style.minHeight = <span class="string">'40px'</span>;</span><br><span class="line">    logDiv.style.maxHeight = <span class="string">'100px'</span>;</span><br><span class="line">    logDiv.style.overflow = <span class="string">'auto'</span>;</span><br><span class="line">    logDiv.style.padding = <span class="string">'4px 6px'</span>;</span><br><span class="line">    logDiv.style.boxSizing = <span class="string">'border-box'</span>;</span><br><span class="line">    logDiv.style.width = <span class="string">'100%'</span>;</span><br><span class="line">    logDiv.style.fontSize = <span class="string">'12px'</span>;</span><br><span class="line">    <span class="keyword">var</span> closeBtn = <span class="built_in">document</span>.createElement(<span class="string">'span'</span>);</span><br><span class="line">    closeBtn.style.display = <span class="string">'inline-block'</span>;</span><br><span class="line">    closeBtn.style.position = <span class="string">'fixed'</span>;</span><br><span class="line">    closeBtn.style.height = <span class="string">'16px'</span>;</span><br><span class="line">    closeBtn.style.width = <span class="string">'16px'</span>;</span><br><span class="line">    closeBtn.style.right = <span class="string">'6px'</span>;</span><br><span class="line">    closeBtn.style.top = <span class="string">'6px'</span>;</span><br><span class="line">    closeBtn.style.border = <span class="string">'1px solid #fff'</span>;</span><br><span class="line">    closeBtn.style.borderRadius = <span class="string">'50%'</span>;</span><br><span class="line">    closeBtn.innerText = <span class="string">'X'</span>;</span><br><span class="line">    closeBtn.style.fontSize = <span class="string">'12px'</span>;</span><br><span class="line">    closeBtn.style.lineHeight = <span class="string">'16px'</span>;</span><br><span class="line">    closeBtn.style.textAlign = <span class="string">'center'</span>;</span><br><span class="line">    closeBtn.style.color = <span class="string">'#ffffff'</span>;</span><br><span class="line">    closeBtn.style.zIndex = <span class="string">'10001'</span>;</span><br><span class="line">    closeBtn.addEventListener(<span class="string">'click'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;</span><br><span class="line">      event.preventDefault();</span><br><span class="line">      <span class="keyword">var</span> logDom = <span class="built_in">document</span>.getElementById(<span class="string">'consoleLog'</span>);</span><br><span class="line">      <span class="built_in">document</span>.getElementsByTagName(<span class="string">'body'</span>)[<span class="number">0</span>].removeChild(logDom);</span><br><span class="line">    &#125;);</span><br><span class="line">    logDiv.appendChild(closeBtn);</span><br><span class="line">    <span class="keyword">var</span> body = <span class="built_in">document</span>.getElementsByTagName(<span class="string">'body'</span>)[<span class="number">0</span>];</span><br><span class="line">    body.insertBefore(logDiv, body.childNodes[<span class="number">0</span>]);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ol start="2">
<li>以后在使用<code>console.log</code>的时候变成<code>createLog(xxx)</code></li>
</ol>
<p>运行截图<br><img src="https://file.lantingshucheng.com/blog/post04/result.png/default" alt="手机上的效果"></p>

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